<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	<style>
			.a{
				width: 200px;
				height: 100px;
				background-color: red;
				display: block;
			}
			.b{
				width: 200px;
				height: 100px;
				background-color: blue;
			}
	</style>
	</head>
	<body>
		<div class="a"></div>
		<div class="b"></div>
	</body>
</html>